PASTEURIZING MILK. 
11 
hot water by cold, while for low temperatures a special set of cooling 
pipes is supplied. The temperature of the heating water can be 
automatically controlled. 
METHOD OF PASTEURIZING MILK IN BULK AND BOTTLING WHILE 
HOT. 
For the pasteurization of milk in bulk a double-walled cylindrical 
tin tank with a capacity of about 3^ gallons was used. The con- 
Pulley 
-?■' 
Cover 
Steam Inlet - - -> 
^.» .___, Thermometers 
l / 
Air Pipe 
Revolving Paddle 
Rubber Tube 
with Pinch Cock 
Fig. 
-Apparatus for pasteurizing milk and bottling while hot. 
struction of this tank is shown in figure 7. Raw milk was placed 
in the milk tank, where it was heated by hot water in the outer 
jacket. The surrounding water was heated by a steam jet and con- 
stantly agitated by blowing in a small amount of air. During the 
heating the milk was agitated by a paddle supported by the cover 
of the milk tank. The water in the jacket was kept at a temperature 
of about 146° F. The milk was held at a temperature of 145° F. 
